Gun sight mounting



Feb. 12, 1952 E, J. MAR-HNv ET Al. 2,585,395

GUN SIGHT MOUNTING Filed Nov. 28, 1947 WV? Y JMP l g M o L f Wwwymmegs Patented Feb. 12, 1952 GUN SIGHT MOUNTING Edward J. Martin, Pleasant Ridge, and James E. Wilson, Detroit, Mich., assignors to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application November 28, 1947, Serial No. 788,550

1 Claim.

This invention relates to gun sighting means, and more particularly to a xed mount upon which aplurality of sights can be installed without aiecting the adjustment thereof. In the use of fire arms, and particularly those which are used in competition, it is frequently desired to change the type or power of the sights used.

It is therefore an object of our invention to provide a fixed pre-adjusted base upon which a plurality of different sighting or aligning means can be supported without a new adjustment.

It is a further object of our invention to provide a special sight mount for interchangeable sight units.

It is 'a still further object of our invention to provide a sight mount which is easily installed permanently on the gun and remains in said position.

With these and other objects in view which will become apparent as the specification proceeds, our invention will be best understood by reference to the following specification and claim and theillustrations in the accompanying drawings, in which:

Figure 1 is a partial perspective view showing a gun with our novel base and a sighting means supported thereon.

Figure 2 is an enlarged vertical sectional view through the sight and mount taken on line 2-2 of Figure 3.

Figure 3 is a sectional view taken on line 3-3 of Figure 2.

Fig-ure 4 is a perspective view of the mount alone.

Referring more specifically to the drawings, there is shown in Figure l a gun 2 upon the rear portion of the breech of which, adjacent the stock, is mounted a base member indicated generally at 4 for supporting a sight 6. This base member, best shown in Figure 4, is a compound member and consists of a part 8, which is shaped to conform to the outline of the gun and which is held or secured thereto by any suitable means such as cap screws I0. On this base portion 8 there is mounted, :by any suitable securing means such as screws II, a rectangular member I2 having a pair of long parallel slits I4 cut into the member from one end and extending almost the full length of the member. At the inner end of these slits they are turned toward each other and further cut to provide a narrow neck portion I6, which is the only support for a tongue section I8. This tongue portion is, therefore, resiliently supported from the remainder of the block and can be moved in any direction with respect thereto.

In one side of the main block I2 there is drilled an opening 20. which is threaded and into which is inserted a headless set screw 22, whose inner end is adapted to bear against one side of the tongue I8, and thus, when the screw is driven in, will move the tongue sideways. Directly opposite the first screw in the other side of the block there is provided a second screw 24, identical with the rst and adapted to bear against the opposite side of the tongue I8, so that the tongue is clamped between the two set screws 22 and 24, and can be adjusted in a horizontal plane. as one is backed off and the other driven in. A vertical hole 26 is drilled through the outer end of the tongue, and an adjusting set screw 28 is adapted to be inserted therein, which bears against the upper surface of the base 8, and thus provides vertical alignment of the tongue about its necked portion IB. It is thus obvious that we have provided both vertical and horizontal adjustments for the tongue.

The sighting means, whatever it may be, is adapted to be seated on the tongue, which has been pre-adjusted or is adjusted with some sighting means thereon, and therefore. the tongue has a raised/suriae/llwhich acts as the actual contact surface mfor the sighting means. There is also/provided a central opening 32 for the securing means, such as 34, -for the sight. There is shown in this application an optical sight such as 8, but it is obvious that any sight having a portion which will t on the pre-adjusted base can be used. It will be obvious that with the sight applied both the vertical'and horizontal adjusting set screws are available for adjustment, and that after the same have been adjusted, the sight bracket itself can be removed and another applied without disturbing in any way the setting. This sight mount has the further advantage that there are no pvoted parts, and, therefore, no parts to wear or become loose. Also, that the device is very simple and can be adjusted in one plane or direction without disturbing the setting in the other plane.

We claim:

In a gun sight mount, a two part base rigidly secured to a gun, said rst part of `said base having longitudinal parallel spaced slots to provide a longitudinal central tongue member and side arms, said tongue member secured to the rst part of said base by only a narrow neck, opposed screw means in the arms adjacent the outer end of the tongue and bearing thereagainst to force the same to a desired position horizontally and lock it, vertical screw means in the outer end of the tongue bearing against the second part of the base to vertically adjust the tongue and means for detachably securing sighting means to the tongue.

EDWARD J. MARTIN.

JAMES E. WILSON.

REFERENCES CITED The following references are of record in the ie of this patent:

UNITED STATES PATENTS Number Name Date Windridge Sept. 26, 1905 Noske June 30, 1936 Sherman Apr. 6, 1937 Stokey Oct. 5, 1937 Mossberg Oct. 11, 1938 Pomeroy .f.-- Jan. 16, 1940 Grant Dec. 5, 1944 

